[PDF] Top 20 Variations in the polar cap area during two substorm cycles
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Variations in the polar cap area during two substorm cycles
... the polar cap bound- ary, or open/closed field line boundary, at all local times, allowing the amount of open flux in the magnetosphere to be ...the Polar spacecraft, SuperDARN HF radar measurements ... See full document
20
Motion of the dayside polar cap boundary during substorm cycles: I. Observations of pulses in the magnetopause reconnection rate
... 3. During periods of southward IMF δ was generally positive, at least up until about 10:00 ...oval. During 10:00–11:00 UT the boundary is very close to L-shell-aligned, and after 11:00 UT there was a ... See full document
17
Motion of the dayside polar cap boundary during substorm cycles: II. Generation of poleward-moving events and polar cap patches by pulses in the magnetopause reconnection rate
... 1996; Pinnock et al., 1995; Farrugia et al., 1998). We have looked at the various mechanisms that have been proposed for polar cap patch production. We have provided strong evidence that at least the ... See full document
20
Polar cap index comparisons with AMIE cross polar cap potential, electric field and polar cap area
... the area. The asymptotic limit of the area is almost 60 10 12 m, which is over a factor of 2 larger than the asymptotic limit for January ...These two combined imply that the area ... See full document
5
Modulation of nightside polar patches by substorm activity
... the polar cap, and return sunward flows at lower latitudes on the dawn and dusk sides of the ...between two closely spaced pointing ...the two beam directions is insignificant on the scale of ... See full document
10
The pulsed nature of the nightside contribution to polar cap convection: repetitive substorm activity under steady interplanetary driving
... of polar cap contraction and convec- tion enhancement can be explained by the two-component expansion–contraction model of plasma ...individual polar cap contraction events in the ... See full document
15
IMF effect on the polar cap contraction and expansion during a period of substorms
... the substorm onset as defined, based on the AE index (see ...complex variations in magnetic ...place during and in the end of the expansion phase of the first substorm: the recovery phase of ... See full document
14
Polar cap patches observed during the magnetic storm of November 2003: observations and modeling
... of polar cap patches observed early during the recovery phase of the major magnetic storm of 20 November 2003 to investigate the origin of the polar cap ...patches. During this ... See full document
17
Propagation of low frequency geomagnetic field fluctuations in Antarctica: comparison between two polar cap stations
... with substorm activity during nighttime ...noon; two more events, occurring during southward interplanetary magnetic field conditions, in one case even during a moderate storm, show ... See full document
8
Joule heating patterns as affunction of polar cap index
... the polar cap (PC) index and season. We find that during times of negative PC, reminiscent of a reverse convection sit- uation in the polar cap, Joule heating is confined to a limited ... See full document
11
On the retreat of near-Earth neutral line during substorm expansion phase: a THEMIS case study during the 9 January 2008 substorm
... nT) during the interval of 06:58 ∼ 07:03 UT, which indi- cates the earthward passing of a flux ...the polar cap open magnetic field flux, psi, was still increasing slightly as shown in ...the ... See full document
9
Method to locate the polar cap boundary in the nightside ionosphere and application to a substorm event
... the polar cap boundary was ap- plied to a substorm event on 6 November ...electrojets. During the substorm growth phase, the polar cap expands and the region of the ... See full document
13
Two Simple Variations of Top Trading Cycles
... Trading Cycles is widely regarded as the preferred method of assign- ing students to schools when the designer values efficiency over ...Trading Cycles has an undesirable feature when objects may be ... See full document
17
Polar cap convection/precipitation states during Earth passage of two ICMEs at solar minimum
... 1 Introduction We present a study of certain aspects of the spatial and tem- poral structure of the reconnecting magnetosphere associated with dawn-dusk and inter-hemisphere asymmetries in polar cap ... See full document
20
Polar cap influx
... Abstract. This study uses digital ionosonde data from a cusp latitude station (Cambridge Bay, 77 ◦ CGM lat.) to study the convection into the polar cap. Days when the IMF mag- netic field was relatively ... See full document
7
Substorm time magnetic field perturbations in the polar magnetosphere: POLAR observations
... of substorm-time magnetic field perturbations in the high-altitude polar magnetosphere, corresponding to the polar lobe, using data from the POLAR spacecraft together with ground-based CANOPUS ... See full document
9
Dayside and nightside contributions to cross-polar cap potential variations: the 20 March 2001 ICME case
... of polar cap convection and auroral electro- jet intensifications during a 5-h-long interval of strong forc- ing of the magnetosphere by an ICME/Magnetic cloud on 20 March ...the polar ... See full document
13
Variations of auroral hydrogen emission near substorm onset
... tion during the substorm at the temporal scales of 2–3 min after onset, when both the intensity and the shape of the hy- drogen emission line profile varied ...dramatically. During the first 2 min ... See full document
13
Polar cap ion beams during periods of northward IMF: Cluster statistical results
... as during prolonged periods of northward IMF the plasma sheet gets colder and denser because of increased penetration of solar wind plasma into the magnetospheric tail ... See full document
17
Climatology of rapid geomagnetic variations at high latitudes over two solar cycles
... omagnetic variations at high latitudes based on the occur- rence of large time derivatives of the horizontal magnetic field (dH /dt exceeding 1 nT s −1 ...than two solar cycles, confirms and ... See full document
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